Washington auto insurance law requires a liability policy with limits
of at least 25/50/10, which means $25,000 for injury to another person,
$50,000 for injuries to all other persons, and $10,000 for physical
damage to another's property.

Drivers visiting from another state still have to comply with Washington
State's Mandatory Auto Insurance Law. Check your insurance policy. Generally
there is a broadening clause which allows for the policy liability limits
to rise to meet the minimum required in the state of operation.